Unit 4 Work and Energy Unit Test Review

To perform Work, you must

• Use a force to move an object in the same direction as the force

• Use a light switch to light up a light bulb

• send out numerous job applications

• Lay as still as possible

Work's formula is

• F= m x a

• W=F x d

• P = W/t

• W = x y z

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A machine

• is any object that makes performing work harder

• is a giant robot used to save the world

• is someone who works a lot

• is any object that assists in doing work

Which of these is NOT a simple machine

• Screw

• Wedge

• bicycle

• Inclined Plane

Inclined Planes (like ramps) help make work easier by

• allowing a smaller force to be exerted over a longer distance

• causing a greater force to be exerted over a shorter distance

• offering moral support and making us feel better about what we accomplished

• increasing the amount of Work you have to do

Where do humans get their energy from?

• Gravitational Potential Energy

• The chemical energy in food

• The chemical energy in batteries

• Creating energy by sleeping

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The energy of something that is in motion

• Chemical

• Nuclear

• Kinetic

• Gravitational

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A measure of how much Output Force is done by a machine compared to the force we put in

• Buoyancy

• Mechanical Outrage

• Mechanical Advantage

• Force Advantage

A mechanical advantage of 5 would mean

• the machine puts out 5 times more force than we put in

• The machine puts out 5 times less force than we put in

• The machine is 5 years old. And today is its birthday

• It takes 5 machines to do the work of 1 human

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The point where a lever pivots is called the

• breadcrumb

• halfcrum

• wedge

• fulcrum